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I proportions of from illustrative of PATENT onnrcn.

HENRY PHELPS GAGE AND WILLIAM. OHITTENDEN TAYLOR, 0F CORNING, NEW YORK,

ASSIG-NOBS TO CORNING GLASS WORKS, OF CORNING,

. F NEW YORK.

NEW YORK, A CORPORATION GLASS.

No Drawing.

To all whom it may concern:

Be it known that we, HENRY PHELPS GAGE and .WILLIAM OHITTENDEN TAYLOR, citizens of the United States of America, and residents of Corning, New York, have invented certain new and useful Improvements in Glass, of which the following is a specification.

Our invention relates to a lass which has high transmission for the u tra-violet rays while absorbing practically all of the visible light, and which is useful for certain purposes where such a glass is desirable.

In making our improved glass, We make use of our discovery that oxid of nickel (N iO) when melted in a suitable batch in a to 12 per cent. of the total, gives a glass having the properties desired. If, however, certain ingredients are present in the glass in substantial proportions, the desired results are not obtained to the highest extent. Among these undesirable' ingredients are lime, ma esia, lead oxid, alumina, and boric oxid. ither soda or potash can be used as the alkali, while barium oxid and zinc oxid can be used as bases.

The following are compositions of glass the broader aspects of this invention:

Ram ta glasses.

SiO 48 54.1% 51 57.4% K 0 15.3 17.4 Na,0 10.6 12.1 BaO 24.7 28 26.4 30.0 N10 12.0 0.5 12.0 p 0.5

Zinc glasses.

s10 53 0. 60.0% 68.0% K,0 20.0 22.5 Na, O 13.8 15.5 ZnO 15.0 17.0 14.2 16 mo 12.0 0.5," 12.0 0.5

It will be noted that as shown by the above formula, a considerable variation in Specification of Letters Patent.

subject-matter of claims in Patented June 3, 1919.

Application filed May 28, 1918. Serial No. 237,108.

however, that the most desirable results are obtained by a glass of the following composition S10 K 0 16% B210 25% NiO 9% If it is desired to reduce the transmission of the red without increasing the percentage of the nickel oxid, a small percentage of cupric oxid may be added. An excess of this, however, should be avoided as it tends to also reduce the ultraviolet transmission. For instance, one or two per cent. of the cupric oxid. (and preferably the former) can be used, replacing an equal quantity of the nickel oxi in formula 9.

The zinc glasses herein disclosed as illustrative of our broad invention form the Sr. No. 258,056, filed Oct. division hereof.

' Having thus described our invention, we claim 1. A glass substantially magnesia.

2. A glass containing nickel oxid and absorbing substantiallyall the visible rays of light yet transmitting freely the ultra-violet portion of the spectrum.

3. A glass containing from to 12% nickel oxid adapted to transmit ultra-violet and infra-red radiations, and which absorbs all light from the visible portion of the spectrum.

4. A glass containing'froin to 12% nickel oxid substantially free from lead oxid, lime and magnesia.

14, 1918, as a containing nickel oxid and free from lead oxid, lime and our application 5. A glass having high ultra-violet transmission to which nickel oxid has been added to absorb the visible light rays Without increasing the absorption of the ultra-violet rays.

6. A barium lass containing from 13% to 12% niokeloxi 7 A glass composed of potassium barium silicate colored with oxid of nickel.

' 8. A glass colored With over nickel oxid, the nickel oxid being the sole coloring oXid with the exception of not more than 2% copper oxid.

9. A barium glass containing not over 2% copper oXid, and also nickel oXid up to 12% 15 and no other coloring oxide. 10. A baryta glass colored nickel.

In testimony whereof We have hereunto set our hands this 27th day of May, 1918.

HENRY PHELPS GAGE. WILLIAM CHITTENDEN TAYLOR.

With oxid of 

